KR970002264B1 - A supervisory system - Google Patents

Abstract

A system for monitoring abnormal state of customers' security system is provided to continuously check multiple sensors coupled to the security system through a communication line after occurrence of an alarm by a sensor. The monitoring system comprises a microcomputer(91) provided in a customer's side for producing a signal for checking a plurality of sensors provided in a customer's side; a sensor detecting device(9) including a multiplexer(93) for producing signals for controlling a plurality of switches(82) which provides the microcomputer(91) with the output signal of the sensors; a second microprocessor(81) provided in the central controlling unit(8) for producing a switching signal in response to the abnormal sensing signal sent by the microcomputer(91) to verify the plurality of sensors; a filter(85) for converting signals through one of the switches(82) into a DC signal; a band pass filter(86) for detecting inaudible signals passed by the filter.

Description

Subscriber's abnormal condition monitoring system

1 is a system diagram of an abnormal condition monitoring system of a subscriber according to the present invention.

2 is a system diagram for easily identifying an abnormal state for one subscriber.

3 is a detailed view of the level detector shown in FIG.

4 is a signal waveform diagram of each part of FIG.

* Explanation of symbols for main parts of the drawings

1, 2, 3: telephone 4, 5, 6: telephone line

7: Telephone Office 8: Central Control Center

9, 10, 11: sensor detection device 12, 13, 14: sensor

81, 91: micom 82, 94, 95, 96: switch

85: notch filter 86: bandpass filter

87 low tone level detector 92 clock generator

93: Multiplexer

The present invention relates to a security and disaster prevention system used to remotely monitor the state of one or more sensors installed on the subscriber side, and in particular, when a plurality of sensors are installed on the subscriber side, another sensor is generated after an alarm is generated by one sensor. The present invention relates to an abnormal condition monitoring system of a subscriber to continuously monitor the status of the subscriber.

In the conventional security and disaster prevention system, a method for monitoring an abnormal state of a subscriber is to perform a polling operation using an audible frequency or an inaudible frequency irrespective of an ON / OFF hook of a subscriber telephone. If multiple sensors (for example, fire, theft, or a specific function sensor are installed) are recognized at the same time, two alarm signals are detected at the same time. The next signal could not be detected by the central control center because it was sent to the control center, for example, if a deliberate fire occurred immediately after a thief broke into a subscriber's house, the subscriber's control unit simultaneously receives the theft and fire alarms. The subscriber control unit transmits only theft alarm received first to the control unit of the central control center. Or you can take over and give them a thief in the crime, but the company could not be dispatched to a fire truck fire voltage.

Therefore, the present invention has been invented in view of the above situation, and when the subscriber side recognizes two or more alarm signals at the same time, the central control center stops the transmission of the first alarm signal for a short period of time. An object of the present invention is to provide an abnormal condition monitoring system for a subscriber to generate the next alarm signal so that two or more alarm signals can be simultaneously recognized by the central control center.

The present invention for achieving this purpose is a subscriber abnormality monitoring system of the security and disaster prevention device interconnected by the central control center and a plurality of subscribers by each telephone line, which is installed on the subscriber side to check the status of a plurality of sensors A microcomputer for generating a control signal and a clock generator for generating a clock signal under the control of the microcomputer, and a signal for controlling a plurality of switches operated by the clock signal to provide a sensor signal to the subscriber microcomputer. A sensor detecting device including a multiplexer; A central control center side microcomputer generating a switching signal to check a plurality of sensors by inputting an abnormal signal transmitted from the subscriber side microcomputer, a switching switch operating under the control of the central control center side microcom, DC filter for converting 60HZ audio signal, inaudible frequency signal and noise signal into DC signal, Notch filter for controlling 60HZ audio signal among the filtered signals, Bandpass filter for detecting only the inaudible frequency signal And a central control center 8 including a level detector for detecting the level of the inaudible frequency signal.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of an abnormal condition monitoring system of a subscriber according to the present invention, in which a plurality of subscriber telephones 1, 2, and 3 are connected to respective telephone lines 4, 5, and 6, respectively. And these telephone lines 4, 5, 6 are connected to the telephone station 7, and a plurality of telephone lines 4, 5, 6 are connected to the central control center 8, the central control center 8 Is connected to the sensor detection devices 9, 10, 11 on the subscriber side through the telephone lines (4, 5, 6). Each sensor detection device (9, 10, 11) is connected to a plurality of sensors 12, 13, 14, these sensors (12, 13, 14) is a thief intrusion shock sensor, fire detection sensor, or various It may also be a sensor that detects the fixing of the machine.

In FIG. 1, three sensors 12, 13, and 14 are connected to each of the sensor detecting devices 9, 10, and 11, but the present invention is not limited thereto, but only for simplification of the specification. A sensor may be added that can perform a function, such as a security function, a home automation function, or a dual security function.

The system of FIG. 1 operates as follows. That is, when inquiring about the abnormal state of the subscriber side, the central control center 8 selectively transmits the home frequency, particularly the inaudible frequency signal, to the subscriber side sensor detection device 9, 10 or 11. Upon transmission, the sensor detection device 9, 10 or 11 receives this and responds to the central control center 8 in response to the presence or absence of an abnormal state of the sensor 12, 13 or 14 as an audible frequency signal (or an inaudible frequency signal). Re-transmitted bar, the central control center will recognize this and notify the fire department 15, police station 16 or the security company 17 according to the abnormal state of the subscriber. For example, when the sensor 12 is an anti-theft prevention sensor, when a notification signal for this is received, the sensor detection device 9 notifies the central control center 8 through the telephone line 4, and the central control center 8. By notifying the police station 16 or the security company 17, the sensor detection device 9 is quickly dispatched to the subscriber's home where the thief can be arrested.

However, this function is a general function of a crime prevention and disaster prevention system. In the case where an alarm signal by at least two or more sensors 12 and 13 is received at the sensor sensing devices 9, 10 or 11 at the same time, the sensor sensing device is conventionally used. Since only the first received signal is notified to the central control circuit (8), later received signals can not be recognized at all, but the present invention is to enable the central control sensor to recognize all of these signals. Therefore, the following describes this function.

FIG. 2 is a diagram illustrating a partial system for one subscriber side of FIG. 1 in order to monitor an abnormality state for one subscriber side.

In FIG. 2, the sensor detecting apparatus 9 includes a microcomputer 91, a clock generator 92 for generating a clock signal under the control of the microcomputer 91, and a signal generated by the clock generator 92. It consists of a multiplexer 93 and a plurality of switches 94, 95, 96 which sequentially select signals from the sensors 12, 13, 14 and provide them to the microcomputer 91. In addition, the sensor detection device 9 includes a monitor 97 capable of visually displaying this upon operation of the sensors 12, 13, 14.

In addition, the central control center 8 is turned on / off by the microcomputer 81 for sensing the signal transmitted from the microcomputer 91 of the sensor detection device 9 and the control signal CONT of the microcomputer 81. Switch 82 which is turned off, and resistor 83 and condenser 84 to filter DC line voltages (e.g. 48V and 72V) applied to the telephone line with DC voltage when switch 82 is located at the a-contact. A DC filter, a 60HZ notch filter 85 for filtering 60HZ ripple components, a bandpass filter 86 for removing noise signals from low-tone and noise signals filtered by the notch filter 85, and a bandpass filter. And a level detector 87 for detecting the level of the low tone signal and providing it to the microcomputer 81, and a monitor 88 for displaying an abnormal state on the subscriber side.

In FIG. 2 configured as described above, first, when the central control center 8 is to poll the subscriber for an abnormal state, when a key input signal is input, the microcomputer 81 of the central control center 8 performs polling. Generates a signal (preferably an audible frequency signal), in which case the microcomputer 81 first puts the signal controlling the switch 82 low so that the switch 82 is positioned at the b-contact. Then, the polling signal generated by the microcomputer 81 is applied to the microcomputer 91 on the subscriber side via the b-contact of the switch 82. The microcomputer 91 controls the clock generator 92 to control the multiplexer 93. ) Sequentially turns on the switches 94, 95 and 96. When the switches 94, 95 and 96 are turned on, the signals from the sensors 12, 13 and 14 sequentially turn on and off the respective switches 94, 95 and 96. The microcomputer 91 is provided to the microcomputer 91 via the switches 94, 95, and 96, and when the sensors 12, 13, and 14 are not abnormal, the microcomputer 91 transfers the microcomputer 81 to the microcomputer 81 via the switch 82. To provide.

However, when any one of the sensors 12, 13, and 14 is abnormal, a signal for it is transmitted to the microcomputer 81 via the microcomputer 91, so that the fire department 15 and the police station 16 which reserved the corresponding function. Or the security company 17 is dispatched.

On the other hand, the case where the alarm signal is received by the microcomputer 91 from the sensor 12 and the sensor 13 on the subscriber side in the state where the switch 82 is located at the b-contact point will be described. First, the microcomputer 91 continuously controls the clock generator 92 so that the switches 94, 95, and 96 are sequentially turned on / off by a predetermined time interval by the multiplexer 93. For convenience, the sensor 12 It is assumed that the alarm signal comes from the sensor 13 again after the alarm signal comes from).

At this time, the microcomputer 91 transmits such a state to the microcomputer 81. At this time, the microcomputer 81 provides a control signal CONT to the switch 82 to confirm this, thereby bringing the switch 82 to the a-contact. Position it. When the switch 82 is positioned at the a-contact, a signal such as that of FIG. 4a is applied to the (a) point. Here, the signal applied to point (a) is a combination of a ripple voltage signal of 60 Hz, a low tone signal, and a noise signal, and is converted into a signal as shown in FIG. 4B by the resistor 83 and the capacitor 84. .

However, when this signal passes through the 60HZ notch filter 85, the 60HZ signal is removed as shown in FIG. 4C, and only the low tone and noise signal remain. When the low tone and noise signals pass through the bandpass filter 86 again, only the low tone signal remains. (See also 4d). This low tone signal is then provided to the level detector 87, which shows its detail in FIG.

As shown in FIG. 3, the low tone signal passing through the band pass filter 86 is charged to the charge pump by the capacitor 800 and the resistor 801. The DC voltage signal thus charged is latch circuit 802. ) Is provided to the non-inverting input terminal of the comparator 803.

In Fig. 3, the resistors 804 and 805 are reference voltage setting resistors, and the reference voltages of the resistors 804 and 805 are preferably about 1.2V. Therefore, when the output of the comparator 803 is high, the low tone is recognized, and when the output of the comparator 803 is low, the low tone is not recognized. Eventually, the signal generated by the comparator 803 is provided to the microcomputer 81 shown in FIG. 2, and the switch 82 is located at the b-contact so that one abnormal signal from the microcomputer 91 comes in. 81 can move the switch 82 to the a-contact to easily detect which sensor an abnormal signal is coming from.

The present invention operating as described above is characterized by providing a complete security and disaster prevention system by continuously monitoring which sensor is abnormal in the central control center when the subscriber side recognizes two or more alarm signals at the same time.

Claims (1)

Claims [1] A subscriber abnormality monitoring system of a security and disaster prevention apparatus, in which a central control center and a plurality of subscribers are interconnected by respective telephone lines; A microcomputer 91 installed at the subscriber side to generate a control signal for checking the state of a plurality of sensors, a clock generator 92 for generating a clock signal under the control of the microcomputer 91, and the clock signal A sensor detecting device (9) including a multiplexer (93) for operating to generate a signal for controlling a plurality of switches for providing a signal of the sensor to the microcomputer (91); A microcomputer 81 for generating a switching signal to check a plurality of sensors by inputting an abnormal signal transmitted from the microcomputer 91, a switching switch 82 operating under the control of the microcomputer, and the switch 82 DC filter for converting the 60HZ audio signal, the non-audible frequency signal and the noise signal passing through the DC signal, and a notch filter 85 for removing the 60HZ audio signal from the filtered signal. And a central control center (8) comprising a band pass filter (86) for detecting bay and a level detector (87) for detecting the level of said inaudible frequency signal.